בן הא הא

Ben HaHa [see above Ben Bag Bag] and it appears that they were contemporaneous, as Ben HaHa brought the teaching of Ben Bag Bag. [And in Tosafot on Chagigah, it is stated that there were converts, Ben Avraham and Sarah, who were given the "He" to each of them; therefore, they are called HaHa. See above regarding Abtalion, that a convert cannot speak the "He," and it is understood]. And there is an Amora named Ben Hai Hai who said to Hillel [(in his name)], and perhaps he was a Tanna during the time of Hillel.